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1, 1, 5, 16, 86, 448, 3580, 34981, 448628, 6854130, 121173330, 2403140605, 52655943500, 1260724587515, 32726520985365, 915263580719998, 27432853858637678, 877211481667946811, 29807483816421710806, 1072542780403547030073, 40739888428757581326987
(列表;图表;参考;听;历史;文本;内部格式)
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